[CMake] Adding cross-compiler support to CMake ...

[Brandon J. Van Every]

Sean McBride wrote:
> However, the whole idea of TRY_COMPILE is of course incompatible with
> this, since the minute you assume that the machine doing the building is
> the same type as the machine you are building for, you are in trouble...
>   

Actually it's not invalid to compile it.  That's what a cross-compiler 
does.  It's invalid to run it.  CMake already has this distinction 
between TRY_COMPILE and TRY_RUN, so if TRY_RUN is used inappropriately, 
that's user error.  If CMake knows it's in some kind of 
cross-compilation mode, it can disallow TRY_RUN and deliver an error.


Cheers,
Brandon Van Every